Question

A bookstore had 80 copies of a magazine. Yesterday, it sold 1/4 of them. Today, it sold 1/5 of what remained. How many copies does the bookstore have left?

Answer 1

The bookstore has 48 left.

Explanation:

If yesterday the bookstore solve 1/4 of 80 magazines then it sold:

`1/4 xx 80 -> 80/4 -> 20`

So at the end of the day it had `80 - 20` magazines left or 60 total magazines left.

Today it sold 185 of 60 (the total left from yesterday) or:

`1/5 xx 60 -> 60/5 -> 12`

So, at the end of today it had `60 - 12` magazines left or 48 total magazines left.